package com.yukino.gulimall.cart.interceptor;

import com.yukino.common.constant.AuthServerConstant;
import com.yukino.common.constant.CartConstant;
import com.yukino.common.vo.MemberRespVo;
import com.yukino.gulimall.cart.vo.UserInfoVo;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.UUID;

/**
 * 在执行目标方法之前，判断用户的登录状态，并封装传递给controller目标请求
 */

public class CartInterceptor implements HandlerInterceptor {

    public static ThreadLocal<UserInfoVo> threadLocal = new ThreadLocal<>();

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        UserInfoVo userInfoVo = new UserInfoVo();

        HttpSession session = request.getSession();
        MemberRespVo member = (MemberRespVo) session.getAttribute(AuthServerConstant.LOGIN_USER);
        // 已登录用户，设置userId
        if (member != null) {
            // 用户已登录
            userInfoVo.setUserId(member.getId()); //明确下登录用的是UserId，临时用户用的是UserKey
        } else {

        }
        Cookie[] cookies = request.getCookies();
        if (cookies != null && cookies.length > 0) {
            for (Cookie cookie: cookies) {
                String name = cookie.getName();
                if (name.equals(CartConstant.TEMP_USER_COOKIE_NAME))  {
                    userInfoVo.setUserKey(cookie.getValue());
                    userInfoVo.setTempUser(true);
                }
            }
        }

        // 如果没有临时用户一定分配一个临时用户
        if (StringUtils.isEmpty(userInfoVo.getUserKey()) && StringUtils.isEmpty(userInfoVo.getUserId())) {
            String uuid = UUID.randomUUID().toString().replace("-","");
            userInfoVo.setUserKey("GULI-" + uuid);
        }
        // 目标方法执行之前
        threadLocal.set(userInfoVo);
        return true;
        // TODO 登录之后删除临时购物车
    }

    /**
     * 业务执行之后
     * @param request
     * @param response
     * @param handler
     * @param modelAndView
     * @throws Exception
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        UserInfoVo userInfoVo = threadLocal.get();
        // 如果是临时用户，返回临时购物车的cookie
        if (!userInfoVo.isTempUser()) {
            Cookie cookie = new Cookie(CartConstant.TEMP_USER_COOKIE_NAME, userInfoVo.getUserKey());
            cookie.setDomain("gulimall.com");
            cookie.setMaxAge(CartConstant.TEMP_USER_COOKIE_TIMEOUT);
            response.addCookie(cookie);
        }
    }
}
